summaryrefslogtreecommitdiff
path: root/libc/string/strstr.c
diff options
context:
space:
mode:
Diffstat (limited to 'libc/string/strstr.c')
-rw-r--r--libc/string/strstr.c137
1 files changed, 0 insertions, 137 deletions
diff --git a/libc/string/strstr.c b/libc/string/strstr.c
deleted file mode 100644
index 6aa448787..000000000
--- a/libc/string/strstr.c
+++ /dev/null
@@ -1,137 +0,0 @@
-/* Return the offset of one string within another.
- Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-/*
- * My personal strstr() implementation that beats most other algorithms.
- * Until someone tells me otherwise, I assume that this is the
- * fastest implementation of strstr() in C.
- * I deliberately chose not to comment it. You should have at least
- * as much fun trying to understand it, as I had to write it :-).
- *
- * Stephen R. van den Berg, berg@pool.informatik.rwth-aachen.de */
-/* added strcasestr support, davidm@lineo.com */
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#if defined _LIBC || defined HAVE_STRING_H
-# include <string.h>
-#endif
-
-typedef unsigned chartype;
-
-#if defined(L_strstr)
-
-#define VAL(x) (x)
-#define FUNC strstr
-#undef strstr
-
-#elif defined(L_strcasestr)
-
-#include <ctype.h>
-#define VAL(x) tolower(x)
-#define FUNC strcasestr
-#undef strcasestr
-
-#else
-
-#error "No target function defined."
-
-#endif
-
-char * FUNC ( const char *phaystack, const char *pneedle)
-{
- register const unsigned char *haystack, *needle;
- register chartype b, c;
-
- haystack = (const unsigned char *) phaystack;
- needle = (const unsigned char *) pneedle;
-
- b = *needle;
- if (b != '\0') {
- haystack--; /* possible ANSI violation */
- do {
- c = *++haystack;
- if (c == '\0')
- goto ret0;
- }
- while (VAL(c) != VAL(b));
-
- c = *++needle;
- if (c == '\0')
- goto foundneedle;
- ++needle;
- goto jin;
-
- for (;;) {
- register chartype a;
- register const unsigned char *rhaystack, *rneedle;
-
- do {
- a = *++haystack;
- if (a == '\0')
- goto ret0;
- if (VAL(a) == VAL(b))
- break;
- a = *++haystack;
- if (a == '\0')
- goto ret0;
- shloop:
- ;
- }
- while (VAL(a) != VAL(b));
-
- jin:a = *++haystack;
- if (a == '\0')
- goto ret0;
-
- if (VAL(a) != VAL(c))
- goto shloop;
-
- rhaystack = haystack-- + 1;
- rneedle = needle;
- a = *rneedle;
-
- if (VAL(*rhaystack) == VAL(a))
- do {
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
- if (VAL(*rhaystack) != VAL(a))
- break;
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
- }
- while (VAL(*rhaystack) == VAL(a));
-
- needle = rneedle; /* took the register-poor approach */
-
- if (a == '\0')
- break;
- }
- }
- foundneedle:
- return (char *) haystack;
- ret0:
- return 0;
-}